;;; Compiled by f2cl version:
;;; ("$Id: f2cl1.l,v 1.209 2008/09/11 14:59:55 rtoy Exp $"
;;;  "$Id: f2cl2.l,v 1.37 2008/02/22 22:19:33 rtoy Rel $"
;;;  "$Id: f2cl3.l,v 1.6 2008/02/22 22:19:33 rtoy Rel $"
;;;  "$Id: f2cl4.l,v 1.7 2008/02/22 22:19:34 rtoy Rel $"
;;;  "$Id: f2cl5.l,v 1.197 2008/09/11 15:03:25 rtoy Exp $"
;;;  "$Id: f2cl6.l,v 1.48 2008/08/24 00:56:27 rtoy Exp $"
;;;  "$Id: macros.l,v 1.106 2008/09/15 15:27:36 rtoy Exp $")

;;; Using Lisp International Allegro CL Enterprise Edition 8.1 [64-bit Linux (x86-64)] (Oct 7, 2008 17:13)
;;;
;;; Options: ((:prune-labels nil) (:auto-save t)
;;;           (:relaxed-array-decls t) (:coerce-assigns :as-needed)
;;;           (:array-type ':array) (:array-slicing t)
;;;           (:declare-common nil) (:float-format double-float))

(in-package :clml.lapack)


(let* ((zero 0.0) (one 1.0) (two 2.0))
  (declare (type (double-float 0.0 0.0) zero)
   (type (double-float 1.0 1.0) one) (type (double-float 2.0 2.0) two)
   (ignorable zero one two))
  (defun dlas2 (f g h ssmin ssmax)
    (declare (type (double-float) ssmax ssmin h g f))
    (prog ((as 0.0) (at 0.0) (au 0.0) (c 0.0) (fa 0.0) (fhmn 0.0)
           (fhmx 0.0) (ga 0.0) (ha 0.0))
          (declare (type (double-float) as at au c fa fhmn fhmx ga ha))
          (setf fa (abs f))
          (setf ga (abs g))
          (setf ha (abs h))
          (setf fhmn (min fa ha))
          (setf fhmx (max fa ha))
          (cond ((= fhmn zero)
                 (setf ssmin zero)
                 (cond ((= fhmx zero) (setf ssmax ga))
                       (t
                        (setf ssmax
                              (* (max fhmx ga)
                                 (f2cl-lib:fsqrt (+ one
                                                    (expt (/ (min fhmx
                                                                  ga)
                                                             (max fhmx
                                                                  ga))
                                                          2))))))))
                (t
                 (cond ((< ga fhmx)
                        (setf as (+ one (/ fhmn fhmx)))
                        (setf at (/ (- fhmx fhmn) fhmx))
                        (setf au (expt (/ ga fhmx) 2))
                        (setf c
                              (/ two
                                 (+ (f2cl-lib:fsqrt (+ (* as as) au))
                                    (f2cl-lib:fsqrt (+ (* at at)
                                                       au)))))
                        (setf ssmin (* fhmn c))
                        (setf ssmax (/ fhmx c)))
                       (t
                        (setf au (/ fhmx ga))
                        (cond ((= au zero)
                               (setf ssmin (/ (* fhmn fhmx) ga))
                               (setf ssmax ga))
                              (t
                               (setf as (+ one (/ fhmn fhmx)))
                               (setf at (/ (- fhmx fhmn) fhmx))
                               (setf c
                                     (/ one
                                        (+ (f2cl-lib:fsqrt (+ one
                                                              (expt (* as
                                                                       au)
                                                                    2)))
                                           (f2cl-lib:fsqrt (+ one
                                                              (expt (* at
                                                                       au)
                                                                    2))))))
                               (setf ssmin (* fhmn c au))
                               (setf ssmin (+ ssmin ssmin))
                               (setf ssmax (/ ga (+ c c)))))))))
          (go end_label)
     end_label (return (values nil nil nil ssmin ssmax)))))

(in-package #-gcl #:cl-user #+gcl "CL-USER")
#+#.(cl:if (cl:find-package '#:f2cl) '(and) '(or))
(eval-when (:load-toplevel :compile-toplevel :execute)
  (setf (gethash 'fortran-to-lisp::dlas2
                 fortran-to-lisp::*f2cl-function-info*)
        (fortran-to-lisp::make-f2cl-finfo :arg-types '((double-float)
                                                       (double-float)
                                                       (double-float)
                                                       (double-float)
                                                       (double-float))
          :return-values '(nil nil nil fortran-to-lisp::ssmin
                           fortran-to-lisp::ssmax)
          :calls 'nil)))

